Whether it’s your dream-machine, a work-in-progress or a vehicle that simply gets you from point A to point B, your vehicle is part of who you are. You’ve poured your heart into it, adjusting and refining every detail. Now pour in a motor oil designed to preserve the vehicle you treasure.
We specialize in developing full-synthetic lubricants engineered to deliver exceptional wear protection, maximum fuel economy and clean engine parts. We are Devoted to Protection.™
Exceptional Wear Protection
AMSOIL Signature Series Motor Oil provides 75 percent more engine protection against horsepower loss and wear than required by a leading industry-standard*.
*Based on independent testing of AMSOIL Signature Series 5W-30 in ASTM D7320, as required by the API SN specification.
Better Turbocharger Protection
AMSOIL® Signature Series Synthetic Motor Oil protects against harmful deposits on turbochargers 4X better than Mobil 1® Extended Performance and 3.6X better than Royal Purple® in industry-standard testing.*
*Based on independent, third-party testing of AMSOIL® Signature Series 5W-30, Mobil 1® Extended Performance 5W-30 and Royal Purple® API 5W-30 in the ASTM D6335 bench test required by the API SN Resource Conserving specification. For full test details visit
Engine Builders and Gearheads Love AMSOIL
"If you have a car that you really love, you want to take care of it. That's why I recommend AMSOIL."
~Daniel Boshears, Engine builder and mechanic at the Wellborn Musclecar Museum.
Peace of Mind to Drive Longer Between Oil Changes
Complete protection that fits your schedule. Check out how our motor oil safely extended the drain intervals of Las Vegas taxi cabs operating in extreme temperatures. The same reserve protection is built into every quart of AMSOIL synthetic motor oil, providing you with peace of mind beyond 3,000 miles.